Second Addendum to the 

Transbay Terminal/Caltrain Downtown Extension/Redevelopment Project 

Final Environmental Impact Statement/Environmental Impact Report 

(SCH #95063004)

In April 2004, the Transbay Terminal/Caltrain Downtown Extension/Redevelopment Project 

FEIS/EIR (SCH #95063004) was certified by the City and County of San Francisco, the Peninsula 

Corridor Joint Powers Board, and the San Francisco Redevelopment Agency. A first addendum to 

the FEIS/EIR (dated May 25, 2006) was adopted by the TJPA Board on June 2, 2006 pursuant to 

the Section 15164 of the Guidelines implementing the California Environmental Quality Act 

(CEQA), Public Resources Code sections 21000 et seq.2

 This document constitutes the second 

addendum to the FEIS/EIR pursuant to the Guidelines, Section 15164. 

The proposed Refined LPA (RLPA) for the Caltrain Downtown Extension (DTX) Project 

(hereinafter, “DTX RLPA”) (shown in Figure 1 attached hereto) consists of the following changes 

to the LPA: 

• Two track lead on the surface and below ground leading to the DTX tunnel system to just 

before the Fourth and Townsend Streets underground station; 

• Three tracks beginning at the Fourth and Townsend Streets underground station and 

continuing to the throat section approaching the Transbay Transit Center where the three 

track system splays out to six tracks to accommodate the six platform berthing locations 

within the station; 

• At-grade rail car storage within the existing Caltrain rail storage yard rather than 

underground storage, which would reduce the amount of underground construction 

associated with the project and would not significantly change the existing use of the rail 

storage area; 

• Design provisions to allow for a future connection to the cut and cover tunnel on Townsend 

Street that will facilitate construction of future system capacity for both Caltrain and High 

Speed Rail (HSR), and will be capable of accommodating the construction of a future 

Townsend Street/Embarcadero/Main Street loop with minimal disruption to ongoing rail 

service; and 

• Delay in construction of the tail tracks, pending the outcome of future planning studies 

related to accommodating HSR and optimizing concurrent Caltrain and HSR operations, 

which would reduce the amount of underground construction within the project footprint 

analyzed in the FEIS/EIR at this time. 

All of the changes proposed in the DTX RLPA would consist of a reduction in the size of various 

elements of the DTX project or rearrangement of uses within the project area previously analyzed 

in the FEIS/EIR, and would not change the magnitude of the environmental impacts disclosed in 

the FEIS/EIR. As described in the FEIR/EIS, Table 5.20-3, Pg 5-163, the approved LPA includes 

cut and cover construction along Townsend Street between Fourth and Fifth Streets up to Second 

Street. 

 

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 The CEQA Guidelines are found at California Code of Regulations, title 14, sections 15000 et seq. 

April 19, 2007

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Therefore, the DTX RLPA would not require major revisions to the FEIS/EIR due to new or 

substantially increased significant environmental effects. Furthermore, there have been no 

substantial changes with respect to the circumstances under which the DTX RLPA would be 

undertaken that would require major revisions of the FEIS/EIR due to new or substantially 

increased significant environmental effects; and there has been no discovery of new information of 

substantial importance that would trigger or require major revisions to the FEIS/EIR due to new or 

substantially increased significant environmental effects. Therefore, no subsequent or supplemental 

environmental impact report is required prior to approval of the DTX RLPA. 

Figure 1: Refined Locally Preferred Alternative (RLPA)

April 19, 2007

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